linux-kernel - Re: [PATCH 11/12] sched: use for_each

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Date:   Mon, 9 Jul 2018 12:36:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 11/12] sched: use for_each_if in topology.h

On Mon, Jul 09, 2018 at 10:36:49AM +0200, Daniel Vetter wrote:
> Avoids complaints from gcc about ambiguous else clauses.

Is that a new thing? I'm fairly sure I've never seen it do that,

> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> ---
>  include/linux/topology.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/topology.h b/include/linux/topology.h
> index cb0775e1ee4b..4fba5a5b148d 100644
> --- a/include/linux/topology.h
> +++ b/include/linux/topology.h
> @@ -40,7 +40,7 @@
>  
>  #define for_each_node_with_cpus(node)			\
>  	for_each_online_node(node)			\
> -		if (nr_cpus_node(node))
> +		for_each_if (nr_cpus_node(node))

Not having gotten any of the other patches, I'm not really sure what
this does and such, but improve readability it does not :/